Vagrant: Avoid mis-leading error during setup

With the use of Friendicas auto-installation feature and the pre-configured
config file, the admin email address is set. Setting it again after the
installation is compleated will generate a mis-leading error message.

bin/dev/vagrant_provision.sh

@@ -116,10 +116,6 @@ bin/console user password "$ADMIN_NICK" "$ADMIN_PASSW"
 bin/console user add "$USER_NICK" "$USER_NICK" "$USER_NICK@friendica.local" en
 bin/console user password "$USER_NICK" "$USER_PASSW"
 
-# set the admin
-bin/console config config admin_email ""$ADMIN_NICK@friendica.local""
-
-
 # create cronjob - activate if you have enough memory in you dev VM
 # cronjob runs as www-data user
 echo ">>> Installing cronjob"